Soft magnetic ferrite resin composition, soft magnetic ferrite resin composition molded product, and power transmission device for non-contact power feeder system

Abstract

An object of the present invention is to provide a power transmission device for a non-contact power feeder system which has high power transmission efficiency and high impact resistance. The above object of the present invention can be achieved by a soft magnetic ferrite resin composition molded product comprising a filler and a binder, in which the filler comprises soft magnetic ferrite particles having an average particle diameter of 5 to 35 μm, the binder comprises at least one material selected from the group consisting of a thermoplastic resin and a soft polyolefin resin, and the soft magnetic ferrite resin composition molded product has a molding density of 3.2 to 4.7 g/cm 3 and a magnetic permeability of 5 to 15, and a power transmission device for a non-contact power feeder system which comprises the above soft magnetic ferrite resin composition molded product.

1 . A soft magnetic ferrite resin composition molded product comprising a filler and a binder, which filler comprises soft magnetic ferrite particles having an average particle diameter of 5 to 35 μm, which binder comprises at least one material selected from the group consisting of a thermoplastic resin and a soft polyolefin resin, and which soft magnetic ferrite resin composition molded product has a molding density of 3.2 to 4.7 g/cm 3  and a magnetic permeability of 5 to 15. 
     
     
         2 . The soft magnetic ferrite resin composition molded product according to  claim 1 , wherein an inductance of the soft magnetic ferrite resin composition molded product is 3.5 to 6 μH. 
     
     
         3 . The soft magnetic ferrite resin composition molded product according to  claim 1 , wherein a power transmission efficiency of the soft magnetic ferrite resin composition molded product is 55 to 80%. 
     
     
         4 . The soft magnetic ferrite resin composition molded product according to  claim 1 , wherein the filler comprises a spinel-type ferrite. 
     
     
         5 . The soft magnetic ferrite resin composition molded product according to  claim 1 , wherein the soft magnetic ferrite particles have a compressed density of 2.5 to 5 g/cm 3  and a specific surface area of 0.3 to 4 m 2 /g. 
     
     
         6 . The soft magnetic ferrite resin composition molded product according to  claim 1 , wherein the binder comprises at least one thermoplastic resin selected from the group consisting of nylon 6, nylon 12, nylon 612, nylon 9T, polyphenylene sulfide, an ethylene-ethyl acrylate copolymer, a styrene-isoprene-styrene block copolymer and a styrene-ethylene/butylene-styrene block copolymer, or at least one thermoplastic resin selected from the group consisting of a styrene-isoprene-styrene block copolymer and a styrene-ethylene/butylene-styrene block copolymer and a soft polyolefin resin constituted of an ethylene-butylene copolymer. 
     
     
         7 . The soft magnetic ferrite resin composition molded product according to  claim 1 , wherein a content of the soft magnetic ferrite particles in the soft magnetic ferrite resin composition molded product is 88 to 97% by weight. 
     
     
         8 . A power transmission device for a non-contact power feeder system comprising the soft magnetic ferrite resin composition molded product as claimed in  claim 1 , and a coil attached to the soft magnetic ferrite resin composition molded product. 
     
     
         9 . A soft magnetic ferrite resin composition comprising a filler and a binder, in which the filler comprises soft magnetic ferrite particles having an average particle diameter of 5 to 35 μm, the binder comprises at least one material selected from the group consisting of a thermoplastic resin and a soft polyolefin resin, and a molded product of the soft magnetic ferrite resin composition has a molding density of 3.2 to 4.7 g/cm 3 . 
     
     
         10 . A non-contact power feeding method comprising the power transmission device for a non-contact power feeder system as claimed in  claim 8 .